Armature for electrical machines.



R. M. WARREN. ARMATURE FOR ELECTRICAL MACHINES.

APPLICATION FILED NOV. 22, I913.

Patented Apr. 20, 1915.

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unwrap STATES PATENT OFFICE.

' ROBERT MACK WARREN, or SUMTER, SOUTH CAROIJINA, AssIGNoR 'ro SUMTEBELECTRICAL COMPANY, or SUIVITER, soU'rH CAROLINA, A CORPORATION OF SOUTHCAROLINA.

ARMATURE FOR ELECTRICAL MACHINES.

' i-rrmatures for Electrical Machines, of which i of same.

the following is a, specification, reference being had to theaccompanying drawing.

My invention relates to armatures for electrical machines, and consistsin certain improvements in the form of certain laminae forming part ofthe core, and in the assembly In the accompanying drawings, Figure 1 isa front view of the armature ends; Fig. 2, aside view of same; Fig. 3, aView of a la'mina hereinafter referred to as left hand lamina; Fig. 4:,a view of a lamina hereinafter referred to as a right hand lamina; Fig.5, a view of a center lamina; Fig. 6, a view showing the various laminaeassembled with the ends. Fig. 7, a view illustrating the assemblyof thelaminae shown in Figs. 3 and 4, Fig. 8, a cross section on the line aZ), Fig. 2. Figsx9 and 10 show modifications in the form of the centerribs of laminae which may be used instead of those shown in Figs. 3, iand 5.

Like figures of reference denote the same parts wherever they are shown.

In armatures of this type, it isdesirable that the ribs 1, which areembraced by the winding, be made as thin'a's possible. VVhen these ribsare made of the desired thinness, and the core of the armature is builtup of center laminations of the usual form as shown in Fig.5, and thebolts 2 and dare used to secure the structure together, the ribs 1 willbe forced outwardly as shown by the-dotted line 4. This not onlydistorts the winding space, but also causes a considerable number of theribs to break in assembly. Heretofore attempts have been made to remedythis trouble, by making the center ribs 1 substantial enough to clampthe laminations in place, and secondly, to pass a bolt through thecenter of the ribs and all the laminations; but either of these remediesconsider ly decrease the electrical efficiency of the armatu re. theefficiency by placing 'a large amount of material where 1t ifembraced bythe winding. The second is not only open to the Specification of LettersPatent 1, ROBERT MACK WAR- The first aifects Patented a rfao, 1915.

Application filed November 22, 1913. Serial No. 802,421. I

same objection as the first, but also necessitates drilling and tappingthe ribs 1.

An armature is assembled according to my improved method, by placin";against one end piece shown in Fig. 1, a left hand lamina as shown inFig. 3 and on top of this,

.a right hand lamina as shown in Fig. 4:. It

will be noted that the ribs 5 and 6 of these laminae are not on top ofeach other, but he side by side so that a free space equal in thicknessto one lamina, exists when additional center laminae are added.

Against the two laminae shown in Figs. 3 and 4, are placed a sufi'icientnumber of center laminae as shown in Fig. 5 until an armature of thedesired length is obtained, whereupon, before the remaining end isplaced in position, another pair of laminae consisting of one right handand one left hand piece, are placed in position as previously described.

It will be observed that two holes are formed through the ends 7 of alllaminae and end pieces and in these holes suitable bolts 2- and-3 areplaced to secure the strii cture together, or same is secured many othersuitable manner.

It will now be observed that when the bolts 'are'tightened, the ends aredrawn together clamping the laminae between them, and that on each endof the group of center laminae there are two laminaehaving their centerribs so formed that expansion of the center portion of the centerlaminae is pos sible. The ribs 5 and 6 on each end of the core areaccordingly squeezed more or less past each other, and allow for thebulging of the ribs of the center laminae that would otherwise distortthe ribs 1 of thecast ends.

I do not wish to limit myself to the particular form of laminae hereshown, but con sider my invention to embrace broadly all modificationsof the shape of some of the.

laminae, respectively. The end lamina, Fig.v

9 has a center rib 8, adapted to fit in the cut-out lamina shown in Fig.10. It is obvious how this arrangement. a,.comphshes the same resultwhen assembled, as the lamv inae shown in Figs. 3, 4 and 5.

substantially as described.

'2. In an armature for electrical machines, end members having centerribs, a plurality of laminae having center ribs of width equal to thecenter ribs of the end members, a plurality of laminae having centerribs of less width than the first mentioned laminae and adapted topermit expansion of the center ribs of the laminae without permit:

ting said center ribsto distort the ribs of the end members, and meansfor securing and said end members, said last mentioned laminae havingcentral ribs so disposed as to permit lateral expansion of the ribs ofsaid core laminae to take place without distorting the ribs of said endmembers, substantially as described.

In testimony whereof I hereunto ailix my signature in the presence oftwo Witnesses.

ROBERT MACK WARREN.

Witnesses H. R. VAN DEVENTER, F. Q. MANNING.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. (1.

